method

readchar

v1_9_3_392 - Show latest stable - 0 notes - Class: ARGF

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What's this?

readchar() public

Reads the next character from ARGF and returns it as a String. Raises an EOFError after the last character of the last file has been read.

For example:

$ echo "foo" > file
$ ruby argf.rb file

ARGF.readchar  #=> "f"
ARGF.readchar  #=> "o"
ARGF.readchar  #=> "o"
ARGF.readchar  #=> "\n"
ARGF.readchar  #=> end of file reached (EOFError)

Show source

static VALUE
argf_readchar(VALUE argf)
{
    VALUE ch;

  retry:
    if (!next_argv()) rb_eof_error();
    if (TYPE(ARGF.current_file) != T_FILE) {
        ch = rb_funcall3(ARGF.current_file, rb_intern("getc"), 0, 0);
    }
    else {
        ch = rb_io_getc(ARGF.current_file);
    }
    if (NIL_P(ch) && ARGF.next_p != -1) {
        argf_close(ARGF.current_file);
        ARGF.next_p = 1;
        goto retry;
    }

    return ch;
}

readchar

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